LOW-ALLOYED HOT ROLLED SHEET STEEL Russian patent published in 2010 - IPC C22C38/46 

FIELD: metallurgy.

SUBSTANCE: invention relates to steel metallurgy, and can be used for manufacturing of low-alloyed hot-rolled sheet steel applied in carriage engineering. Steel contains carbon, silicon, manganese, sulphur, phosphorus, chrome, nickel, copper, nitrogen, aluminium, vanadium and iron, at following ratio of components, wt %: carbon up to 0.12, silicon 0.17 - 0.37; manganese 0.5 - 0.8; sulphur up to 0.025, phosphorus 0.07 - 0.12, chrome up to 0.3, nickel up to 0.3, copper 0.3 - 0.5; nitrogen 0.01 - 0.02, aluminium 0.03 - 0.08, nickel vanadium 0.05-0.07; iron - the rest. Steel allows σ_B - not less than 510 MPa, σ_t - not less than 390 MPa, δ₅ ≥ 19%, values of impact elasticity - at normal temperature after strainageing - 123-132 kJ/m² and at -70°C 127 - 131 kJ/m².

EFFECT: increasing of strength and plastic properties and also impact elasticity at cost saving for steel.

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